A man who was shot Friday in a gunfight with Salinas police died from his injuries, and a second person has been arrested after investigators uncovered evidence indicating he may have played a role in the robbery that started it all.

Richard L. Chacon Jr., 32, was shot by police who stopped his vehicle after 1 p.m. Friday in North Salinas as part of an investigation into the armed robbery of a Walmart store the day before.

Police said Chacon opened the driver's-side door of his vehicle and began shooting toward the officers, who returned fire, wounding him. Chacon was transported to a local hospital, where he later died of his injuries. The officers were not injured.

Police surrounded a residence in the neighborhood near Constitution and Nantucket boulevards that they believed may have been associated with Chacon, blocking off the area while they attempted to hail anybody inside the home.

That standoff lasted past 11 p.m. Friday.

Police believe Chacon is the person who entered the Walmart at 1800 N. Main St. about 10:15 a.m. Thursday dressed as a security guard, then brandished a gun at an employee and left with an undisclosed amount of cash.

On the day of the robbery, police said, investigators arrested Jose Eliseo Agustin, 21, an assistant manager at the store, after gathering enough evidence to indicate that he may have been involved.

Agustin was booked into Monterey County Jail on charges of robbery and conspiracy to commit robbery, with gang enhancements.

Police said the investigation into Agustin and his relationship to Chacon is ongoing.

A press conference is expected to be held Monday, when more details about the robbery and shooting will be provided, a police spokesman said Saturday.